Some of the WW II veterans in my Regiment have worn a cutaway blue blazer with Regimental crest, trews and Glengarrian. Something they likely picked up while in the UK and brought back to Canada. As the number of veterans dwindles, so, too has this dress style. I have not seen anyone in blue blazer and kilt at any unit function but the ubiquitous blue blazer, grey flannels and tartan tie seems to be popular for those not opting for trews. Kilted folk tend to wear tweed, argyle or PC jackets. The "patrol" jacket is also quite sharp; without rank or accoutrements it might be a suitable alternative. I personally think a plain patrol jacket with kilt is very dressy.